Xylem 19-001-290B Residential Fire Pump Package - Manual (Page 5)

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3.1 Whenever the riser water pressure falls below the
system pressure switch setting the pump will start
through a power relay.
3.2 When the system pressure rises above the setting of
the system pressure switch the pump will stop (pro-
vided the minimum run timer has expired.)
3.3 ADJUSTMENTS AND SETTINGS
3.3.1 System Pressure Switch
3.3.2 Back out the locking screw (see Figure 1) to allow
main adjustment wheel to turn freely.
a) Determine the pressure to be maintained across
the sprinkler system.
b) Adjust main adjustment wheel (see Figure 1) to de-
sired setting for pump to turn ON.
c) Turn main adjustment wheel counterclockwise to
increase or clockwise to decrease pressure. Each
number on main adjust wheel represents an ap-
proximate window shift of 1.8 psi for EPS40-2. For
each 1/2 rotation of the adjustment wheel the win-
dow changes by approximately 11 psi for EPS40-2.
The LED on Out3 will come ON in the control panel
when pressure switch is activated.
d) The pressure switch has a fixed differential which
doesn't require adjustment for turning OFF the
pump. The approximate differential varies from 3
psi @ 10 psi system pressure to 6 psi @ 100 psi
system pressure.
e) Retest the set point several times to ensure the
accuracy of the setting and to ensure the pump
starts and stops at the correct pressure.
f) Re-seat locking screw.
3.3.6 The minimum run timer is factory set to 5 minutes.
The setting should be verified before the unit is placed
into operation and adjusted if a shorter minimum run
time is desired. Do not adjust the timer with power
applied to the unit. Set the run timer by moving the
small black plastic jumper on the right side of the
PCB to 15 seconds, 30 seconds, 1 min, 2 min, 3 min,
4 min, or 5 min. The system will default to 15 sec-
onds if no jumper is used.
3.3.7 Optional Tank
3.3.8 Refer to the specific IOM that was shipped with the
tank for installation and operating instructions.
3.3.9 Procedure to set Relief valve:
a) Switch ON the pump by opening the test valve
slowly to create a pressure drop.
b) Close the test valve after the pump turns ON.
c) Let the pump run until it reaches the set pressure
and switches OFF.
d) Loosen (counterclockwise) adjusting screw in
relief valve until it releases pressure.
Section 3 - Putting the Unit Into Service
CAUTION: Prevent subsequent damage. A unit
showing symptoms of possible problems (noise,
leaks, vibration, and/or continual operation) must be cor-
rected immediately. FAILURE TO FOLLOW THESE
INSTRUCTIONS COULD RESULT IN PROPERTY DAM-
AGE AND/OR MODERATE PERSONAL INJURY.
CAUTION: Relief valve exhaust must be piped to
an adequately sized drain. FAILURE TO FOLLOW
THESE INSTRUCTIONS COULD RESULT IN PROPERTY
DAMAGE AND/OR MODERATE PERSONAL INJURY.
WARNING: Electrical shock hazard. Disconnect and
lockout power before servicing the unit. FAILURE TO
FOLLOW THESE INSTRUCTIONS COULD RESULT IN
SERIOUS PERSONAL INJURY, DEATH, AND/OR PROP-
ERTY DAMAGE.
WARNING: Electrical shock hazard. Disconnect and
lockout power before servicing the unit. FAILURE TO
FOLLOW THESE INSTRUCTIONS COULD RESULT IN
SERIOUS PERSONAL INJURY, DEATH, AND/OR PROP-
ERTY DAMAGE.
FIGURE 1